I had my C1000 on the charger all night.
It was working fine before I turned it off.
I took it off the charger this morning and turned it on, and the screen lit briefly then went blank.
I tried the on/off button a few times.
I tried removing/installing the battery and rebooting a couple times.
Then I plugged the charger in and the screen came on.
Unplug the charger, the screen goes off.
Plug it in, the screen comes on.
Then I restored the last backup I had made with backup/restore, and it has worked perfect ever since.
After all that, the battery showed 100%, so it wasn't a dead battery.
Does anyone have any idea what might have been going on with it?